I'm not sure, I have not received any of them. The users in question are deleting them for fear of viruses.
I hate to say it, but a truly blank E-mail can't contain a virus. This requires hand-holding of the user, to find out whether the E-mail is truly blank or not, whether it has headers, etc.
Alternatively, you can check your IMail SMTP log file entries (or the virus scanner log file entries, if appropriate) to see how big the E-mail was when it was received (the IMail SMTP or SMTP- lines with "ldeliver" on them have a number at the end of the line that indicates the file size; the SMTPD line that has the queue file name also has the file size at the end of the line). That won't help quite as much, but can help determine whether or not a virus was present (if it is 2K or less, it's nearly impossible that there was a virus).
-Scott
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